Air purifier



FIG. 1 is a front perspective view of an air purifier showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a plan view thereof;

FIG. 8 is a bottom view thereof; and,

FIG. 9 is a section view thereof taken along line 9—9 in FIG. 3, wherein an internal structure is omitted.

The broken lines depict portions of the air purifier that form no part of claimed design. 

The ornamental design for an air purifier, as shown and described. 